[Premium-Rx] Cubic R3030 Help

[L D Ritta]

Hello Everyone

Well I managed to blow the side off a component in my power supply. I have have never used one these before.
There are two of them, one across the ac input the  other across dc side of the bridge rectifer. This CR12
right under switch S1 What is it? I need to replace it and I don't know what to order. Is this what they use in place of a fuse?
Why didn't they have a fuse?

73 Lee
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